Why are the suction lines and discharge lines different sizes?

Why are the suction lines and discharge lines different sizes?

The line diameter is decided by pressure drop requirement, due to the NPSH requirement for centrifugal pump, that implies a smaller pressure drop limit for the pump suction line; but as the fluid at discharge line is with higher pressure, it allows a higher pressure drop in discharge line.

Why suction side pipe is bigger than discharge?

Suction pressure diameter is usually 1 size higher than discharge, because we need minimum resistance in the suction side to reduce the losses and increase the NPSHa.

Is the suction line bigger or smaller?

It’s standard practice to employ suction-side piping one or two sizes bigger than the pump inlet – you should certainly never use any piping that is smaller than the pump’s inlet nozzle. Small pipes result in larger friction losses, which means it costs more to run your pumping system.

Why discharge of centrifugal pump is largest?

Centrifugal pump is a kinetic device. So the liquid entering the pump receives kinetic energy from the rotating impeller. The centrifugal action of the impeller accelerates the liquid to a high velocity, transferring mechanical (rotational) energy to the liquid. So it discharges the liquid in high rate.

What is pump discharge?

Discharge Head: This is the vertical distance that you are able to pump liquid. For example, if your pump is rated for a maximum head of 18 feet, this does not mean that you are restricted to 18 feet of pipe. Suction Lift: This is the vertical distance that the pump can be above the liquid source.

What is the difference between suction and discharge?

Discharge Head – The outlet pressure of a pump in operation. Suction Head – The inlet pressure of a pump when above atmospheric pressure. Suction Lift – The inlet pressure of a pump when below atmospheric pressure.

Is the suction line smaller?

The suction pipe of a centrifugal pump is not necessarily a larger bore (diameter) than the discharge pipe. They can be the same size. However, the design philosophy differs slightly between the suction and discharge lines: Liquid lines are sized primarily on the basis of velocity.

What size Lineset do I need?

When installing refrigeration lines, make sure you have the correct size line based on the length of run. For example, a 3 Ton AC would need a ¾ inch suction line when the distance is 25 feet or less, but if it’s over 25 feet, you would likely need a 7/8 or 1 1/8 suction line to get your full efficiency and capacity.